26" Inner Tube from Shwalbe
[tubeShwa26]

Fitted to my mountain bike with 26 x 1.95 tyres: A nice inner tube from a quality manufacturer Trax with a sturdy stainless steel valve that is easy to fit.
The valve is threaded all the way down to the rim so you can fit the retaining ring loosely while you fit the tube so that you are not trying to hold it in place while you fit the tube round the rim at the same time.